Antitheft system

ABSTRACT

In an antitheft system for preventing an equipment comprising moving objects such as electric vehicles or operating machine such as lawnmower from theft, an electronic key is prepared to be carried by an operator of the equipment and stores authenticating data for identifying the operator who carries the electronic key. An authenticator is installed at the equipment and performs authentication check as to whether the electronic key is an authorized key using stored key-checking data, when the authenticating data is outputted from the electronic key, whereas an electronic key copier is provided separately from the equipment and copies the electronic key, thereby enabling to make a copy of the electronic key without activating equipment, while ensuring to prevent the equipment from theft.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to an antitheft system, particularly to a systemfor preventing equipment such as a moving object or operating machinefrom theft.

2. Description of the Related

In recent years, for equipment such as a moving object(s) (specificallya small electric car(s), automobile(s) or the like) to be shared bymultiple operators (users), various systems have been developed thatprevent theft of the equipment, as taught by, for example, JapaneseLaid-Open Patent Application No. 2001-43431 (particularly in paragraphs0064 to 0069, FIG. 7, etc.). The reference is configured such that, whenthe operator inserts an electronic key that stores operator-specificauthenticating data (ID) into an authentication device (readingmechanism) that is installed in the equipment and stores key-checkingdata for verification, and when the authenticating data outputted fromthe key and the key-checking data are not identical, the system does notallow use of the equipment.

SUMMARY OF THE INVENTION

When the equipment is shared by multiple users as mentioned above, it ispreferable for convenience that each user has his/her own electronickey, and accordingly the same number of copies of the key as the usersshould be made. In that case, the operator will usually copy the key byusing the authentication device installed in the equipment. For thatpurpose, the operator will store the key-checking data corresponding tothe key to be copied and must activate the equipment every time the keyis to be copied. This is troublesome and tedious.

An object of this invention is therefore to overcome the aforesaidproblem by providing an antitheft system that can make a copy of anelectronic key without activating equipment such as a moving object oroperating machine, while ensuring to prevent the equipment from theft.

In order to achieve the object, this invention provides a system forpreventing an equipment from theft, comprising: an electronic key thatis adapted to be carried by an operator of the equipment and storesauthenticating data for identifying the operator who carries theelectronic key; an authenticator that is installed at the equipment andperforms authentication check as to whether the electronic key is anauthorized key using stored key-checking data, when the authenticatingdata is outputted from the electronic key; and an electronic key copierthat is provided separately from the equipment and copies the electronickey.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the invention will be moreapparent from the following description and drawings in which:

FIG. 1 is a perspective view of a small electric vehicle on which a partof an antitheft system according to a first embodiment of this inventionis mounted;

FIG. 2 is a front view of a control panel of the vehicle shown in FIG.1;

FIG. 3 is a block diagram showing the configuration of the system forthe vehicle shown in FIG. 1;

FIG. 4 is a flowchart showing the operation of the system, specificallythe sequence of operations of an authentication ECU thereof;

FIG. 5 is a flowchart showing the operation of copying an electronic keyamong the operations of the system;

FIG. 6 is an explanatory view schematically showing authenticating datastored in the keys shown in FIG. 3;

FIG. 7 is a flowchart showing the operation of writing into a first keyamong the operations of the system;

FIG. 8 is an explanatory view showing the relationship between the keyand vehicle shown in FIG. 3;

FIG. 9 is an explanatory view similar to FIG. 8, but showing therelationship between an electronic key and a small electric vehicleaccording to a prior art;

FIG. 10 is a side view of a lawnmower on which a part of an antitheftsystem according to a second embodiment of this invention is mounted;

FIG. 11 is a plan view of the lawnmower shown in FIG. 10;

FIG. 12 is an enlarged cross-sectional view of an internal combustionengine shown in FIG. 10;

FIG. 13 is a block diagram showing the configuration of the system forthe lawnmower shown in FIG. 10;

FIG. 14 is a flowchart showing the operation of the system shown in FIG.10, specifically the sequence of operations of the authentication ECUthereof;

FIG. 15 is a subroutine flowchart showing the operation for storingoperation parameters of FIG. 14;

FIG. 16 is a subroutine flowchart showing the operation for storingabnormal-state operation parameters of FIG. 14;

FIG. 17 is a flowchart similar to FIG. 14, but showing the operation ofthe system, specifically the sequence of operations of theauthentication ECU thereof;

FIG. 18 is a flowchart showing the operation of an analyzer shown inFIG. 13, specifically the sequence of operations of a terminal devicethereof; and

FIG. 19 is an explanatory view showing operating history and otherinformation displayed on a display unit of the terminal device shown inFIG. 13.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An antitheft system according to embodiments of the invention will nowbe explained with reference to the attached drawings.

FIG. 1 is a perspective view of a small electric vehicle on which a partof an antitheft system according to a first embodiment of this inventionis mounted.

In FIG. 1, reference numeral 10 generally indicates the small electricvehicles (equipment). As illustrated, a plurality of (e.g., three)vehicles 10 are indicated by reference numerals 10 a, 10 b, 10 c.Although the vehicles 10 will be explained taking the vehicle 10 a as anexample, since the other vehicles 10 b, 10 c have the substantially sameconfiguration, the following explanation can also be applied thereto.

The vehicle 10 is a relatively small, single-passenger, electricvehicle, precisely an electric wheelchair or electric four-wheel scooterequipped with a body frame 14 supported by four wheels 12 (one of whichis not shown in FIG. 1), a seat 16 installed on the frame 14 to be takenby the operator (user) P, and an operation unit 20 to be manuallyoperated by the operator P. The vehicle 10 is a moving object that movesat extremely low speed, i.e., at a human walking speed, and is suitablefor the elderly.

An electric motor 22 for driving the wheels 12 (specifically rearwheels) and a battery (i.e., a lead battery) 24 for supplying operatingpower to the motor 22 and the like are installed under the seat 16. Themotor 22 is a brushless motor.

FIG. 2 is a front view of the operation unit 20 of the vehicle 10 shownin FIG. 1.

As shown in FIG. 2, the operation unit 20 comprises a loop-shaped handle20 b laterally projecting, as curving, from a dashboard 20 a, two drivelevers 20 c that laterally projects and allows the operator P to input amoving/stopping instruction, a speed setting knob 20 d that allows theoperator P to set a desired travel speed within a range startingcontinuously from 1 km/h up to 6 km/h, forward/reverse switches 20 ethat allows the operator P to input a traveling direction instructionbetween forward and reverse travels, a horn switch 20 f that allows theoperator P to sound a horn (not shown), a power switch key 20 g thatallows the operator P to connects/disconnects power from the battery 24to the motor 22, and other components.

Two drive switches 20 h are installed near the drive levers 20 c. Thedrive switch 20 h produces an ON signal when one of the drive levers 20c is manipulated by the operator P to drive and an OFF signal whenmanipulated by the operator P to stop. A speed setting knob sensor 20 iis installed near the knob 20 d and produces an output or signal (speedinstruction) corresponding to the desired travel speed set by theoperator P through the speed setting knob 20 d.

Details of the vehicle 10 are described in Japanese Laid-Open PatentApplication No. 2007-112363 proposed by the applicant earlier and thefurther explanation is omitted here.

FIG. 3 is a block diagram showing the configuration of the antitheftsystem for the vehicles 10.

In FIG. 3, reference numeral 26 designates the antitheft system. Thesystem 26 comprises an electronic key 30 that stores authenticating data(ID; explained later), a control ECU (electronic control unit) 32installed in each vehicle 10 for controlling the operation of the motor22 and the like, and an authentication ECU (electronic control unit;authenticator) 34 installed in each vehicle 10 for authenticating thekey 30. The ECUs 32, 34 are disposed at an appropriate location in eachvehicle 10, specifically near the power switch key 20 g in the interiorof the dashboard 20 a of the operation unit 20, as clearly shown in FIG.2.

The control ECU 32 comprises a microcomputer having a CPU 32 a, memory(EEPROM non-volatile memory) 32 b and other components. The control ECU32 is inputted by the operator P with a traveling direction instructionthrough the forward/reverse switch 20 e, a drive instruction through thedrive switch 20 h, and a speed instruction through the speed settingknob sensor 20 i. The control ECU 32 controls the operation of the motor22 and the like in response to those instructions, thereby controllingthe operation of the vehicle 10.

Specifically, the operator P selects a traveling direction using theforward/reverse switch 20 e and sets desired travel speed using thespeed setting knob 20 d. Then, when the operator P grips or grasps oneof (or both of) the drive levers 20 c with the handle 20 b, the vehicle10 starts moving at the set speed, and when the operator P releases it,the vehicle 10 stops.

The authentication ECU 34, similarly to the control ECU 32, comprises amicrocomputer having a CPU 34 a, memory (EEPROM (non-volatile memory))34 b for storing key-checking data (explained later), and othercomponents. The authentication ECU 34 further comprises a reader/writer34 c for reading authenticating data stored in the key 30, and an LED(light-emitting diode (signal lamp)) 34 d installed on the dashboard 20a for informing the operator P of the result of electronic keyauthentication (pass/fail) which will be explained later.

The so-configured authentication ECU 34 is connected for communicationwith the control ECU 32 through a serial communication line 36. The ECUs32, 34 are connected to the battery 24 through a power line 40 to besupplied with operating power from the battery 24.

The key 30 is a contact-less IC (integrated circuit) card equipped witha CPU 30 a, a non-volatile memory 30 b for storing authenticating data(i.e., identification data (user ID) for identifying the operator P whocarries the key 30 and identification information (product ID) foridentifying the model, product number, etc., of the vehicles 10), and anantenna 30 c for exchange (input/output) with the reader/writer 34 c ofauthenticating data and the like by short-distance wirelesscommunication (RFID: Radio Frequency Identification). The IC cardconstituting the key 30 is a card made of resin and houses the CPU 30 aand other components in its interior. As shown in FIG. 2, it is madeportable to be carried by the operator P.

There now follows an explanation of the certification process that isone aspect of the communication activity between the key 30 andreader/writer 34 c of the authentication ECU 34. When the operator Pmoves the key 30 to the reader/writer 34 c after the ECU 34 has beensupplied with operating power from the battery 24, the reader/writer 34c outputs (transmits) radio wave to the key 30.

Upon receipt of the radio wave transmitted by the reader/writer 34 c,the key 30 generates power by electromagnetic induction of a built-incoil (not shown), thereby activating the CPU 30 a and the like. In otherwords, the key 30 is not equipped with a battery or other internal powersupply source but is supplied with operating power induced by the radiowave from the reader/writer 34 c.

Upon being supplied with power, the CPU 30 a of the key 30 outputs theauthenticating data stored in the memory 30 b to the reader/writer 34 cthrough antenna 30 c. When the authenticating data is outputted from thekey 30, the authentication ECU 34 uses the key-checking data stored inthe memory 34 b to perform an authentication check to determine whetherthe key 30 is an authorized key. The key-checking data is identical tothe authenticating data and is the unique data (user ID and product ID)set for each vehicle 10 a, 10 b, 10 c.

The ECU 34 performs the authentication by comparing the authenticatingdata in the key 30 with the key-checking data. Specifically, theauthenticating data and the key-checking data are compared each other todetermine whether they are identical, and the key 30 moved to thereader/writer 34 c is discriminated to be an authorized key for thevehicle 10 if they are the same and not to be an authorized key if theydo not match.

The key 30 is thus a contact-less (wireless) IC card that caninput/output (communicate) authenticating data and the like when theoperator P merely moves it to, but out of contact with, thereader/writer 34 c of the authentication ECU 34.

Since the foregoing configuration enables transmission/reception ofauthenticating data and the like between the key 30 comprising acontact-less IC card and the reader/writer 34 c, it is possible to avoidinconveniences that might arise in the case of transmission/receptionusing a wired communication means to connect an electronic key with anauthentication ECU, specifically problems such as that of datacommunication becoming impossible owing to breaking of communicationcable.

The explanation of the system 26 will be continued. The system 26comprises, in addition to the authentication ECU 34, etc., an electronickey copying unit (electronic key copier) 42 for copying the key 30.

The copying unit 42 is solely provided for a plurality of (three)vehicles 10 a, 10 b, 10 c, separately or independently therefrom. Thecopying unit 42 is equipped with a terminal device 44 for making a copyand a reader/writer 46 connected to the device 44. The device 44 is apersonal computer having a CPU 44 a, a memory 44 b, an input unit 44 cincluding a keyboard, mouse and the like (none of which is shown)operable by the operator P, and a display unit 44 d including a display(screen). The device 44 is connected to a power source (e.g., acommercial power source; not shown) that supplies operating power.

The reader/writer 46 operates similarly to the reader/writer 36 c of theauthentication ECU 34. Specifically, when the key 30 is moved near, thereader/writer 46 outputs a radio wave to the key 30, thereby supplyingoperating power to the key 30, reads authenticating data from the key30, and writes new authenticating data (explained later) into the key30.

The operation of the system 26 thus configured will be explained.

FIG. 4 is a flowchart showing the operation of the system 26,specifically the sequence of operations of the authentication ECU 34thereof. The illustrated program is executed only once when theassociated vehicle 10 is started.

When the operator P operates the power switch key 20 g, precisely, turnson the switch key 20 g while moving the key 30 to the reader/writer 34 cas shown in FIG. 2, the battery 24 commences supplying theauthentication ECU 34 with operating power.

After the ECU 34 is activated with the power supply, the program beginsin S10, in which the reader/writer 34 c outputs radio wave to the key 30to supply operating power.

The program next proceeds to S12, in which the authentication of the key30 is performed using the authenticating data outputted from the key 30and key-checking data.

The program then proceeds to S14, in which it is determined whether thekey 30 was found to be an authorized key for the vehicle 10. When theresult is affirmative, the program proceeds to S16, in which a signalenabling the operation of the motor 22 is sent to the control ECU 32,whereafter the program is terminated. With this, the control ECU 32starts controlling the operation of the motor 22 in accordance with theinstructions inputted via the running switch 20 h, etc., whereby thevehicle 10 is operated normally.

When the result in S14 is negative, the program proceeds to S18, inwhich the signal lamp 34 d is lit to inform the operator P that the key30 was found to be not the authorized key, and to S20, in which a signaldisabling the operation of the motor 22 is sent to the control ECU 32.In response thereto, the ECU 32 stops the operation of the motor 22,thereby stopping the operation of the associated vehicle 10, regardlessof instructions inputted from the running switch 20 h and the like. Thusthe system 26 prevents the vehicle 10 from theft.

When the vehicles 10 a, 10 b, 10 c are to be shared by multipleoperators P, it is convenient for each operator P to have his/her ownkey 30, and accordingly the same number of copies of the key 30 as theoperators P should be made. If each copy of the key 30 can activate allof the vehicles 10 a, 10 b, 10 c, it further enhances convenience.

The operation of copying the key 30 conducted by the copying unit 42 ofthe system 26 will be explained.

FIG. 5 is a flowchart showing the operation of copying the key 30. Theillustrated operation is conducted in the terminal device 44 when thekey 30 is moved to the reader/writer 46 of the copying unit 42.

Before explaining the flowchart of FIG. 5, the explanation on the key 30is made in detail. As described, the authenticating data (ID) is storedin the memory 30 b of the key 30. The key 30 falls into two types, i.e.,a first electronic key (master key) 301 and a second electronic key(duplicate key) 302, depending on a kind of the stored authenticatingdata.

FIG. 6 is an explanatory view schematically showing the authenticatingdata stored in the first and second keys 301, 302. In FIG. 6, the firstkeys 301 before copying are shown on the left side in the drawing andthe first and second keys 301, 302 after copying on the right side.

As shown, a plurality of (i.e., three, more exactly the same number asthe vehicles 10) the first keys 301 are designated by reference numerals301 a, 301 b, 301 c. The first keys 301 a, 301 b, 301 c (before copying)each stores the authenticating data (ID) corresponding to the associatedvehicle 10 a, 10 b, 10 c. In FIG. 6, the authenticating datacorresponding to (i.e., capable to activate) the vehicle 10 a isindicated by ID-a. Similarly, the authenticating data corresponding tothe vehicles 10 b, 10 c are indicated by ID-b, ID-c, respectively.

The authenticating data (ID) in the first key 301 is an ID with whichthe copying unit 42 can make a duplicate key and hereinafter called themaster ID (indicated as “(Master)” in FIG. 6). Thus the first key 301 isa key that can be copied by the copying unit 42.

On the other hand, the second key 302 is a duplicate key of the firstkey 301 made by the copying unit 42 and does not store theauthenticating data (ID) constituted of the master ID. Thus the key 30falls into two types of the first key 301 and the second key 302depending on a kind of the stored authenticating data, i.e., on whetherthe authenticating data is the master ID. In FIG. 6, the authenticatingdata with a term of “copy” in parentheses indicates a copy of the masterID made by the copying unit 42 and hereinafter called the “copy ID.”

Returning to FIG. 5, when the operator P moves the key 30 to thereader/writer 46, the key 30 is supplied with operating power induced bythe radio wave and outputs the authenticating data.

Then the program starts in S100, in which the outputted authenticatingdata is read and the program proceeds to S102, in which the readauthenticating data is displayed on the display unit 44 d.

The program proceeds to S104, in which it is determined whether aninstruction to issue a key ID is inputted by the operator P. The key IDis an ID (number) assigned to the key 30. Specifically, the processingof S104 is conducted for determining whether the operator P has inputtedan ID (e.g., ID-a) to be assigned to the key 30 using the input unit 44c (i.e., has instructed to issue the ID), in other words, for checkingas to whether the operator P desires to copy the key 30.

When the result in S104 is negative, the processing of S104 is repeateduntil the operator P inputs the instruction to issue the key ID, andwhen the result is affirmative, the program proceeds to S106, in whichit is determined whether the key 30 near the reader/writer 46 is thefirst key 301.

When the result in S106 is negative, i.e., when the key 30 is the secondkey 302 or another electronic key, the program proceeds to S108, inwhich an indication of “copying disapproved” appears on the display unit44 d to inform the operator P that a copy of the key 30 cannot be madeand the routine ends. Thus the copying unit 42 is configured to enablecopying of the key 30 only from the first key 301, i.e., disable copyingfrom the second key 302.

When the result in S106 is affirmative, the program proceeds to S110, inwhich the authenticating data (ID) read in S100 is copied and stored inthe memory 44 b as the copy ID. Then the program proceeds to S112, inwhich it is determined whether an instruction to successively performthe processing of storing a copy of the authenticating data by usinganother first key 301 is inputted, and when the result is affirmative,the program returns to S100 and the foregoing processing is repeated.

The processing of S112 is further explained.

When, in S110, for example, a copy of the authenticating data (copy ID;ID-a (Copy)) of the first key 301 a is stored, the operation to storecopies of the authenticating data (ID-b (Copy), ID-c (Copy)) of thefirst keys 301 b, 301 c needs to be successively conducted.

Therefore, the operator P inputs a continuation instruction after a copyof the authenticating data (ID-a (Copy)) of the first key 301 a isstored, while the first key 301 b (or the first key 301 c) is moved tothe reader/writer 46. Specifically, the processing from S100 to S112 isrepeated three times and accordingly, the three authenticating data(ID-a (Copy), ID-b (Copy), ID-c (Copy)) are stored in the memory 44 b.

When the result in S112 is negative because the above operation ofstoring the copy ID is completed, the program proceeds to S114, in whichthe three copy IDs stored in the step of S110 are written into a newelectronic key, which is to be the second key 302. At this time, the newkey to be the second key 302 is moved to the reader/writer 46 by theoperator P.

The program next proceeds to S116, in which an indication of “copyingcompleted” is displayed on the display unit 44 d to inform the operatorP of completion of the second key 302. Thus the second key 302 shown inFIG. 6, i.e., the second key 302 having only copies of the threeauthenticating data (copy IDs), is made.

The program then proceeds to SI 18, in which it is determined whetherthe operator P inputs an instruction to produce another second key 302successively. When the result is negative, the program is terminated,while, when the result is affirmative, the processing of S114 and S116is repeated to make another second key 302.

After making a duplicate key, i.e., the second key 302, from the firstkeys 301 a, 301 b, 301 c as in the foregoing, copies of the threeauthenticating data (copy IDs which are the same as those in the secondkey 302) are written into the first keys 301. Specifically, the threeauthenticating data are stored in the first key 301, thereby enablingthe first key 301 to operate or activate all the vehicles 10 a, 10 b, 10c.

FIG. 7 is a flowchart showing the operation of writing into the firstkey 301. The illustrated operation is conducted in the terminal device44 when the key 30 is moved to the reader/writer 46 after the routine ofFIG. 5 ended.

When the operator P moves the key 30 to the reader/writer 46, the key 30is supplied with operating power induced by the radio wave and outputsthe authenticating data.

The program starts at S200, in which the outputted authenticating datais read and proceeds to S202, in which the read authenticating data isdisplayed on the display unit 44 d.

The program next proceeds to S204, in which it is determined whether aninstruction to write the copied authenticating data (copy ID) isinputted by the operator P. When the result is negative, the processingof S204 is repeated until the operator P inputs the writing instruction,and when the result is affirmative, the program proceeds to S206, inwhich it is determined whether the key 30 near the reader/writer 46 isthe first key 301.

When the result in S206 is affirmative, the program proceeds to S208, inwhich the three authenticating data (copy IDs, i.e., ID-a (Copy), ID-b(Copy), ID-c (Copy)) stored in the memory 44 b are written into thefirst key 301. As a result, the first key 301 shown on the right side inFIG. 6, i.e., the first key 301 storing the one master ID and three copyIDs, is made.

On the other hand, when the result in S206 is negative, the programproceeds to S210, in which an indication of “copy ID writingdisapproved” is displayed on the display unit 44 d to inform theoperator P that writing of the copy ID is not conducted and the routineends. Thus the copying unit 42 is configured to be disabled to write thecopy ID into an electronic key other than the first key 301, aftermaking the second key 302.

Since the three copy IDs are thus written into (stored in) both of thefirst and second keys 301, 302, the authentication ECU 34 canauthenticate the keys 301, 302 as the authorized keys at the nextstarting of the vehicle 10.

This will be explained with reference to FIG. 8. Due to the foregoingcopying operation, each of the first and second keys 301, 302 can storea plurality of (three) authenticating data (ID-a (Copy), ID-b (Copy),ID-c (Copy)) corresponding to the vehicles 10 a, 10 b, 10 c. Therefore,each of the multiple operators P1, P2, P3, P4 can own the key 30, i.e.,the first keys 301 a, 301 b, 301 c or the second key 302, and operate oractivate all of the vehicles 10 a, 10 b, 10 c by the key 30.

On the other hand, in the prior art, as shown in FIG. 9, each duplicatekey 30 stores different authenticating data (ID-a, ID-b or ID-c). Theauthentication ECU 34 of the vehicle 10 stores key-checking datacorresponding to the respective duplicate keys 30 and hence, thevehicles 10 have to be activated one by one to rewrite the key-checkingdata.

In contrast, since the system 26 according to the first embodiment isprovided with the copying unit 42 separately from the associated vehicle10, it becomes possible to make a copy of the key 30 without activatingthe associated vehicle 10. Further, since the key 30 stores the threeauthenticating data (ID-a, ID-b, ID-c), it becomes possible to activateall of the vehicles 10 a, 10 b, 10 c by the single key 30.

As stated above, the first embodiment is configured to have a system(26) for preventing an equipment (small electric vehicle 10) from theft,comprising: an electronic key (30) that is adapted to be carried by anoperator of the equipment and stores authenticating data for identifyingthe operator who carries the electronic key; an authenticator(authentication ECU 34, S12, S14) that is installed at the equipment andperforms authentication check as to whether the electronic key is anauthorized key using stored key-checking data, when the authenticatingdata is outputted from the electronic key; and an electronic key copier(copying unit 42, S100-S118, S200-S210) that is provided separately fromthe equipment and copies the electronic key.

With this, since the copying unit 42 is provided separately from orindependently of the associated vehicle 10, it becomes possible to makea copy of the key 30 without activating the associated vehicle 10, andby providing the key 30 and the authentication ECU 34, it becomespossible to prevent the equipment from theft.

In the system, the electronic key (30) comprises at least one of a firstelectronic key (301) and a second electronic key (302) copied from thefirst electronic key by the electronic key copier, and the electronickey copier inhibits additional copying of the second electronic key(S106, S108). With this, it becomes possible to restrict copying of thekey 30, i.e., prevent an undesired copy of the key 30 from being made,thereby rendering the management of the key 30 easier.

In the system, the equipment comprises a plurality of moving objects(small electric vehicles 10 a, 10 b, 10 c) and the electronic key storesauthenticating data in a same number as that of the equipment. Withthis, it becomes possible to activate a plurality of the vehicles(equipment) 10 with the single key 30 and hence, the operator P does notneed to have multiple keys for operating the multiple vehicles 10,thereby enhancing convenience.

In the system, the electronic key copier (copying unit 42) comprises aterminal device (44), and a reader/writer (46) that is connected to theterminal device and reads the authenticating data outputted from theelectronic key (30) and writes the authenticating data to the electronickey. With this, it becomes possible to make a copy of the key 30 withthe simple structure.

In the system, the equipment comprises electric vehicles (10 a, 10 b, 10c). With this, it becomes possible to make a copy of the key 30 withoutactivating the vehicles 10 a, 10 b, 10 c, as well as preventing theft ofthe vehicles 10 a, 10 b, 10 c.

In the system, the electronic key (30) comprises an IC card. With this,the foregoing effects can be achieved with the simple structure.

FIG. 10 is a side view of a lawnmower on which a part of an antitheftsystem according to a second embodiment of this invention is mounted andFIG. 11 is a plan view thereof.

In FIGS. 10 and 11, the reference numeral 50 indicates a lawnmower(operating machine; equipment). The lawnmower 50 is a non-ridingself-propelled lawnmower with two front wheels 52F and two rear wheels52R (a total of four wheels), and a handlebar 54. A general-purposeinternal combustion engine (hereinafter called “engine”) 58 is installedbeneath an engine cover 56 on a frame mounted on the four wheels 52F and52R. The engine 58 is equipped with a recoil starter 60 installed to bemanually operable by the operator P (shown only in FIG. 10).

A crankshaft 62 of the engine 58 is connected to a rear wheel drive axle66 via a belt 64, as shown in FIG. 10. The drive axle 66 is connected tothe rear wheels 52R via a gear mechanism 68. A rear wheelelectromagnetic clutch 70 is disposed in the middle of the drive axle66, and the clutch 70 cuts off the transmission of engine output to therear wheels 52R.

A grass-cutting blade 72 is mounted on the distal end of the crankshaft62. A blade electromagnetic clutch 74 is disposed between the blade 72and the belt 64 in the crankshaft 62, and the clutch 74 cuts off thetransmission of engine output to the blade 72. A grass bag 76 isinstalled in the rear part of the lawnmower 50, so that the grass cut bythe blade 72 is collected in the grass bag 76.

A drive lever 78 and a drive switch 80 which produces an ON signal whenthe drive lever 78 is moved to tilt forward by the operator P in thetraveling direction of the lawnmower 50 are installed near the distalend of the handlebar 54. A blade switch 82 is installed on the drivelever 78. The blade switch 82 produces an ON signal when pressed once bythe operator P, and terminates producing the ON signal when pressedagain.

FIG. 12 is an enlarged cross-sectional view of the engine 58 shown inFIG. 10.

The engine 58 has a cylinder 86, and a piston 88 is accommodated thereinto reciprocate. An air intake valve 92 and an exhaust valve 94 aredisposed at a position facing a combustion chamber 90 of the engine 58to open and close the connection between the combustion chamber 90 andan intake passage 96 or exhaust passage 98. The engine 58 specificallycomprises an air-cooled, four-cycle, single cylinder OHV engine, and hasa displacement of, for example, 163 cc.

The piston 88 is coupled with the crankshaft 62. One end of thecrankshaft 62 is attached with a flywheel 100 and the distal end of theflywheel 100 is attached with the recoil starter 60. Although omitted inthe drawing, the blade 72 is installed on the other end of thecrankshaft 62 via the blade electromagnetic clutch 74.

Multiple permanent magnets 102 are fastened to the inside of theflywheel 100 and a magneto coil (alternator) 106 is mounted on the sideof a crankcase 104 so as to face the permanent magnets 102. When thecrankshaft 62 is rotated by operation of the recoil starter 60 orreciprocal motion of the piston 88, the magneto coil 106 generatesalternating current in synchronous with the rotation.

The alternating current generated by the magneto coil 106 is convertedto direct current by a processing circuit (not shown) to be supplied asoperating power to a control ECU, authentication ECU (explained later),ignition circuit (not shown) and the like. The engine 58 can be startedby the operator P by the recoil starter 60, so it is not equipped with abattery. In other words, it is a battery-less type general purposeinternal combustion engine.

A throttle body 108 is installed in the intake passage 96. A throttlevalve 110 and an electric motor 112 for driving the throttle valve 110are accommodated in the throttle body 108. A carburetor assembly (notshown) is provided at a location upstream of the throttle valve 110 andinjects gasoline fuel supplied from a fuel tank (indicated by referencenumeral 114 in FIGS. 10 and 11). The resulting air-fuel mixture is drawninto the combustion chamber 90 through the throttle valve 110, intakepassage 96 and air intake valve 92.

A throttle position sensor 116 is disposed near the motor 112 andproduces an output or signal indicative of position (throttle opening)θTH of the throttle valve 110. A crank angle sensor 118 composed of anelectromagnetic pickup is installed near the flywheel 100 and produces apulse signal at every predetermined crank angle.

FIG. 13 is a block diagram showing the configuration of the antitheftsystem for the lawnmower 50 on which the engine 58 is mounted.

The antitheft system is assigned by the reference numeral 26 a in FIG.13. The system 26 a is equipped with an electronic key 122 that stores,in addition to authenticating data, information on the operating historyof the lawnmower 50 (explained later), a control ECU 124 that isinstalled in the lawnmower 50 and controls the operation of the engine58 and other components, and an authentication ECU 126 that is installedin the lawnmower 50 for authenticating the key 122. As shown in FIGS. 10and 11, the ECUs 124, 126 are both disposed at suitable locations in thelawnmower 50, i.e., inside the engine cover 56 near the recoil starter60.

The control ECU 124 comprises a microcomputer having a CPU 124 a, memory(EEPROM non-volatile memory) 124 b, a counter (not shown) and the like.The outputs of the throttle position sensor 116 and crank angle sensor118 are sent to the control ECU 124, which counts the pulses outputtedby the crank angle sensor 118 to calculate (detect) the engine speed NE.Based on the detected engine speed NE and throttle position θTH, thecontrol ECU 124 calculates a current supply command value for operatingthe motor 112 so as to make the engine speed NE equal to a predetermineddesired speed (e.g., 2,000 rpm) and outputs the calculated command valueto the motor 112 to control its operation.

The control ECU 124 is further inputted with a drive command (ON signal)from the operator P using the drive switch 80 and with a blade operationcommand (ON signal) from the operator P using the blade switch 82. Uponreceiving the drive command, the control ECU 124 engages the rear wheelmagnetic clutch 70 to transmit the rotational output of the engine 58 tothe rear wheels 52R, whereby the lawnmower 50 is self-propelled. Uponreceiving the blade command, the control ECU 124 engages the blademagnetic clutch 74 to transmit the rotational output of the engine 58 tothe blade 72, thereby rotating the blade 72 to enable mowing.

The authentication ECU 126 comprises, similarly to the control ECU 124,a microcomputer having a CPU 126 a, a memory (EEPROM) 126 b for storingkey-checking data and the like, a counter (not shown) and othercomponents. The authentication ECU 126 is further equipped with areader/writer 126 c for reading from the key 122 authenticating datastored therein and writing to the key 122 information indicative of theoperating condition of the lawnmower 50 (i.e., information on theoperating history and failure of the lawnmower 50 (service data) to beexplained later) and with an LED 126 d for informing the operator P ofthe result of electronic key authentication (pass/fail) and the like.

The authentication ECU 126 is connected for communication with thecontrol ECU 124 through a serial communication line 128. The ECUs 124,126 are connected to the magneto coil 106 through a power line 130 to besupplied with operating power generated by the magneto coil 106.

The key 122 is a contact-less IC card similar to that in the firstembodiment equipped with a CPU 122 a, a non-volatile memory 122 b forstoring authenticating data (i.e., identification data (user ID) foridentifying the operator P and identification information (product ID)for identifying the model and the like of the lawnmower 50), and anantenna 122 c for exchange (input/output) with the reader/writer 126 cof authenticating data and the like by short-distance wirelesscommunication.

The IC card constituting the key 122 is also made of resin and housesthe CPU 122 a and other components in its interior. As shown in FIG. 10,the card is made portable to be carried by the operator P. In the secondembodiment, the key 122 may be the first key (master key) or may be thesecond key (duplicate key).

Since the authentication operation, among the operations ofcommunication activity between the key 122 and the reader/writer 126 cof the authentication ECU 126, is the same as the first embodiment, theexplanation thereof is omitted.

When performing the authentication of the key 122, the authenticationECU 126 copies (writes) information on the operating history and thelike in the memory 122 b of the key 122 using the reader/writer 126 c.This will be explained later.

As shown in FIG. 13, the system 26 a having the authentication ECU 126,etc., is further equipped with an analyzer 132 for reading and analyzinginformation stored in the key 122. The analyzer 132 is installed at,independently of the lawnmower 50, such as a repair shop associated witha lawnmower sales outlet (not shown).

The analyzer 132 is equipped with a terminal device 134 used to analyzethe operating history and other information on the lawnmower 50, and areader/writer 136 connected to the device 134. The device 134 is apersonal computer having a CPU 134 a, a memory 134 b, an input unit 134c comprising a keyboard, mouse and the like (none of which is shown)operable by the operator P, and a display unit 134 d comprising adisplay (screen). Although not shown, the device 134 is connected to apower source (e.g., a commercial power source) that supplies operatingpower.

The reader/writer 136 operates similarly to the reader/writer 126 c ofthe authentication ECU 126. Specifically, when the key 122 is movedthereto, the reader/writer 136 outputs radio wave to the key 122,thereby supplying the key 122 with operating power, and reads theauthenticating data, operating history and other information stored inthe key 122.

The device 134 is configured to be able to access an information systemserver 144 through a communication circuit 140 and the Internet (Web;public communication network) 142. The server 144 stores parts dataincluding the specifications, price, inventory and the like of thecomponents (e.g., the engine 58 and authentication ECU 126) constitutingthe lawnmower 50. In other words, the server 144 stores specifications,inventory and other parts data required for ordering a part of thelawnmower 50 when that part fails.

The analyzer 132 can copy the key 122 using the devise 134 andreader/writer 136. The copying operation is performed in the same manneras that by the electronic key copying unit 42 in the first embodiment,so the explanation thereof is omitted. Thus, the analyzer 132 alsofunctions as an electronic key copying unit.

The operation of the system 26 a for the lawnmower (equipment) 50 thusconfigured is explained in the following.

FIG. 14 is a flowchart showing the operation of the system 26 a,specifically the sequence of operations of the authentication ECU 126thereof. The illustrated program is executed at predetermined intervals(e.g., every 100 milliseconds).

The program begins at S300, in which it is determined whether the bit ofa flag ST is set to 0. The bit of the flag ST is set in a laterprocessing step. The bit thereof (initial value 0) being set (reset) to0 indicates that the current program loop is the first program loopfollowing starting of the engine 58, and its being set to 1 indicatesthat the current program loop is the second or a later program loop.

In the first program loop, the result in S300 is affirmative and theprogram proceeds to S302, in which the value of an operating eventcounter CNT indicative of the number of times the lawnmower 50 has beenoperated is incremented by 1, and to S304, in which the bit of the flagST is set to 1. Therefore, in the next program loop the result in S300is negative and S302 and S304 are skipped.

The program next proceeds to S306, in which the operation parameters ofthe lawnmower 50 to be inputted to and outputted from the control ECU124 are stored (saved) in the memory 126 b. These parameters include thethrottle position θTH detected based on the output of the throttleposition sensor 116, the engine speed NE detected based on the output ofthe crank angle sensor 118, the current supply command value for themotor 112, the drive command (ON signal) from the drive switch 80, andthe blade operation command (ON signal) from the blade switch 82.

FIG. 15 is a subroutine flowchart showing the sequence of operations forstoring operation parameters of FIG. 14.

The program begins at S400, in which the present (latest) operationparameters of the lawnmower 50 are sent from the control ECU 124 throughthe serial communication line 128 to be inputted to and stored in thememory 126 b.

The program then proceeds to S402, in which operation parameters storeda first predetermined time earlier (e.g., 1 minute earlier) are erasedfrom the memory 126 b. When no first-predetermined-time-earlieroperation parameters are stored in the memory 126 b, i.e., when thefirst predetermined time has not yet passed after starting of the engine58, S402 is skipped (not executed).

By this process, the operation parameters are collected in (inputted to)the memory 126 b periodically (i.e., every 100 milliseconds) for storageof time-series data (i.e., time-series data over a predetermined period(1 minute)).

Returning to the explanation of FIG. 14, the program next proceeds toS308, in which it is determined whether any abnormality has arisen inthe stored operation parameters, specifically whether any abnormalityhas arisen in the operation parameters because of failure of a component(e.g., the engine 58) of the lawnmower 50. The processing of S308 isconducted by comparing the operation parameters with threshold valuesset for the operation parameters. The threshold values are defined asvalues that enable determination of failure of components of thelawnmower 50.

Therefore, when the processing of S308 finds that an operation parameterexceeds the range of its threshold value, it is discriminated that theoperation parameter is abnormal (i.e., the lawnmower 50 fails). When theoperation parameters are found to be within their threshold ranges, itis discriminated that the operation parameters are normal (i.e., thelawnmower 50 is failure-free).

When the result in S308 is negative, the program proceeds to S310, inwhich it is determined whether, among the stored operation parameters,the throttle position θTH is a predetermined idle position which is setnear the fully closed position. When the result in S310 is affirmative,the program proceeds to S312, in which an idle operation timer isstarted to measure the cumulative (total) time that the engine 58operates at the idle throttle position (the idle operation time T1) andthe measured value is stored in the memory 126 b, in other words, theidle operation time T1 is measured and stored in the memory 126 b.

When the result in S310 is negative, the program proceeds to S314, inwhich it is determined whether the throttle position θTH is apredetermined wide-open position which is set near the fully openedposition. When the result in S314 is affirmative, the program proceedsto S316, in which a wide-open operation timer is started to measure thecumulative time that the engine 58 is kept operating at the wide-openthrottle position (the wide-open operation time T2) and the measuredvalue is stored in the memory 126 b.

When the result in S314 is negative, i.e. when the throttle position θTHis neither the idle position nor the wide-open position and the throttlevalve 110 is partially open, the program proceeds to S318, in which apartially open operation timer is started to measure the cumulative timethat the engine 58 operates at a partially open throttle position (thepartially open operation time T3) and the measured value is stored inthe memory 126 b. When one among the idle operation timer, wide-openoperation timer and partially open operation timer has been started asexplained in the foregoing, the measurement performed thereby isterminated at the time another of the timers is started. As a result,only one of the three timers is always in operation while the engine 58is running.

After the processing of S312, S316 or S318, the program proceeds toS320, in which the total operation duration TA corresponding to thetotal use (operating) time of the lawnmower 50 is calculated and storedin the memory 126 b. Specifically, the sum of the idle operation timeT1, wide-open operation time T2 and partially open operation time T3 iscalculated and stored as the total operation duration TA, whereafter theprogram is terminated.

On the other hand, when the result in S308 is affirmative, the programproceeds to S322, in which operation parameters after operationparameter abnormality was found are stored in the memory 126 b as“abnormal-state operation parameters.”

FIG. 16 is a subroutine flowchart showing the sequence of operations forstoring the abnormal-state operation parameters in S322 of FIG. 14.

The program begins in S500, in which the operation parameters of thelawnmower 50 are sent from the control ECU 124 through the serialcommunication line 128 to be inputted to and stored in the memory 126 b.

The program next proceeds to S502, in which it is determined whether asecond predetermined time (e.g., 1 minute) has passed since theoperation parameter abnormality occurred. This determination is made inanother subroutine (not shown) by starting a counter (up-counter) whenthe operation parameter abnormality occurs and ascertaining whether itscount value has reached the second predetermined time.

When the result in S502 is negative, the processing of S500 is repeated.When it is affirmative, the subroutine is terminated. In other words,the operation parameters after occurrence of abnormality are collected(inputted) and time-series data (i.e., time-series data over the secondpredetermined time (1 minute)) are stored as abnormal-state operationparameter (frozen data).

Returning to the explanation of FIG. 14, the program next proceeds toS324, in which the type of abnormality (failure) of the lawnmower 50 isestimated based on the abnormal-state operation parameters, and an errorcode indicating the estimated abnormality (failure) type is stored inthe memory 126 b.

Thus, information on the operating history (operation parameters, idleoperation time T1, wide-open operation time T2, partially open operationtime T3 and total operation duration TA) and information on failure(abnormal-state operation parameters and error codes) of the lawnmower50 are stored in the memory 126 b. Among the different kinds oflawnmower 50 operating history information, the operation parameters ofthe most recent several cycles (e.g., the most recent 5 cycles) aremaintained in the memory 126 b.

FIG. 17 is a flowchart also showing the operation of the system 26 a,specifically the sequence of operations of the authentication ECU 126.The program shown in FIG. 17 is executed in parallel with the processingof FIG. 14 and is executed only once at the time the engine 58 isstarted.

When the operator P operates the recoil starter 60, more exactly when,as shown in FIG. 10, the operator P operates the recoil starter 60(pulls the recoil starter handle) while holding the key 122 near thereader/writer 126 c of the authentication ECU 126, the engine 58 isstarted, the magneto coil 106 commences power generation, and the ECU126 is supplied with operating power.

After the ECU 126 has been supplied with operating power and activated,the program begins in S600, in which radio wave is outputted from thereader/writer 126 c to the key 122, thereby supplying the key 122 withoperating power, and proceeds to S602, in which authentication of thekey 122 is performed using authenticating data outputted from the key122 and key-checking data.

The program next proceeds to S604, in which it is determined whether inS602 the key 122 held near the reader/writer 126 c was found to be anauthorized key for the lawnmower 50. When the result is affirmative, theprogram proceeds to S606, in which the signal lamp 126 d is lit toinform the operator P that the key 122 was authenticated to be theauthorized key.

The program then proceeds to S608, in which it is determined whether theinformation on operating history and failure stored in the memory 126 bis free of abnormal-state operation parameters. When the result in S608is affirmative, the program proceeds to S610, in which the operatinghistory information stored in the memory 126 b is reproduced in (copiedto) the key 122. Specifically, the information (data) is outputted fromthe reader/writer 126 c and written to the memory 122 b of the key 122.The program then proceeds to S612, in which the engine 58 is operatednormally, whereafter the program is terminated.

On the other hand, when the result in S608 is negative, the programproceeds to S614, in which the signal lamp 126 d is flashed to informthe operator P that an abnormal-state operation parameter was stored inthe memory 126 b during the preceding operation of the lawnmower 50.This amounts to advising the operator P that the lawnmower 50 should beinspected (repaired) because it experienced a failure. Thus, the signallamp 126 d functions to notify the operator P of any failure occurringin the lawnmower 50.

The program next proceeds to S616, in which the operating historyinformation and failure information stored in the memory 126 b arecopied to the key 122, and to S618, in which the operation of the engine58 is terminated by, for example, ignition cut-off. In other words, whena failure occurs, operation of the lawnmower 50 is not allowed.

On the other hand, when the result in S604 is negative, the programproceeds to S620, in which copying of the operating history and otherinformation to the key 122 is not performed. Thus it is configured suchthat information is copied to the key 122 if it is authenticated to bethe authorized key (S610, S616) but the information is not copied if thekey 122 is not authenticated (S620). Following the processing of S620,the program proceeds to S622, in which the operation of the engine 58 isterminated by ignition cut-off or some other means, thereby preventingtheft of the lawnmower 50.

In this embodiment, the operation of the engine 58 is terminated in S622when the key 122 is not the authorized key. However, instead of stoppingthe engine 58, it is possible, for example, to control the upper limitof the engine speed NE of the engine 58, specifically to restrict theupper limit of the engine speed NE to slightly higher than the idlingspeed (but lower than the lowest speed at which mowing is possible). Bypreventing rotation of the blade 72 of the lawnmower 50, thisarrangement makes lawn mowing impossible but allows the lawnmower 50 tobe driven at low speed, thus providing a way to deal with cases wherethe operator P lost the key 122.

The operation of the analyzer 132, which is one of the operations of thesystem 26 a, is explained next. When flashing of the signal lamp 126 das a result of the aforesaid processing makes the operator P aware thatthe lawnmower 50 has a problem, or at the time of a regular maintenanceinspection, the operator P sends the key 122 to a shop equipped with theanalyzer 132 (a shop where a technician able to service and repair thelawnmower 50 is available).

FIG. 18 is a flowchart showing the sequence of operations of theanalyzer 132. The illustrated routine is performed in the terminaldevice 134 of the analyzer 132 when the key 122 is held near thereader/writer 136.

When the key 122 is held near the reader/writer 136 to be supplied withradio wave-induced operating power, it outputs authenticating data,operating history and other information. The program begins in S700, inwhich the authenticating data, operating history and other informationare read by the reader/writer 136. The program next proceeds to S702, inwhich the read authenticating data, etc., are displayed on the displayunit 134 d.

FIG. 19 shows the operating history and other information displayed onthe display unit 134 d.

As shown in FIG. 19, the display unit 134 d displays information on theoperating history, specifically the user ID, product ID, together withservice data such as the total operation duration TA, idle operationtime T1, wide-open operation time T2, partially open operation time T3,number of operating times (operating event counter CNT), operationparameters, error code(s) (when the lawnmower 50 has experienced afailure or the like), and abnormal-state operation parameters.

When the information on the operating history has been displayed on thedisplay unit 134 d, based thereon the service technician determines(troubleshoots) the cause of the lawnmower 50 failure. Based on thedetermined failure cause, the service technician takes remedial actionby accessing the server 144 via the input unit 134 c of the terminaldevice 134, the communication circuit 140 and the Internet 142,specifically by placing an order for a part to replace the one thatfailed, with reference to the part data contained in the server 144.

Use of the key 122 is not limited to cases where the lawnmower 50 breaksdown as discussed above. The operator P can send the key 122 to themaintenance shop when a periodic inspection is due, so that the servicetechnician can use information obtained from the key 122 to estimatewear and tear on the components (engine 58 etc.) of the lawnmower 50,thereby making it possible to perform optimum maintenance procedures.

It should be noted that, in the foregoing, although the number of thelawnmower 50 is one, it can be two or more, and in this case, the key122 stores authenticating data corresponding to each of the multiplelawnmowers 50 and operating history and failure information of thelawnmowers 50.

As stated above, the second embodiment is configured to have a system(26 a) for preventing an equipment (50) from theft, comprising: anelectronic key (122) that is adapted to be carried by an operator of theequipment and stores authenticating data for identifying the operatorwho carries the electronic key; an authenticator (126, S602, S604) thatis installed at the equipment and performs authentication check as towhether the electronic key is an authorized key using storedkey-checking data, when the authenticating data is outputted from theelectronic key; and an electronic key copier (132) that is providedseparately from the equipment and copies the electronic key.

In the system, the electronic key (122) comprises at least one of afirst electronic key (301) and a second electronic key (302) copied fromthe first electronic key by the electronic key copier, and theelectronic key copier inhibits additional copying of the secondelectronic key.

In the system, the equipment comprises an operating machine (50), andthe electronic key stores authenticating data in a same number as thatof the equipment.

And, the system further includes: a memory (126 b) that is installed atthe equipment and stores information on at least one of operatinghistory operating history (operation parameters, idle operation time T1,wide-open operation time T2, partially open operation time T3 and totaloperation duration TA) and information on failure (abnormal-stateoperation parameters and error codes) of the equipment; and theauthenticator copies the information to the electronic key (122), whenperforming the authentication check (S610, S616).

With this, the operating history and failure information can be easilyand reliably read even when the lawnmower 50 experiences a breakdown orthe like, thus offering improved convenience while also making itpossible to prevent theft of the lawnmower 50.

Specifically, the operating history and other information are copied andstored in both the memory 126 b of the lawnmower 50 and the memory 122 bof the key 122. As a result, the information can be easily read from thekey 122 when the lawnmower 50 experiences a breakdown or the like,simply by sending the key 122 to the repair shop (i.e., without need tohaul the lawnmower 50 itself to the repair shop). Since the servicetechnician who repairs the lawnmower 50 can therefore pinpoint the causeof the breakdown from the read information, the breakdown can bepromptly dealt with (namely, the lead-time between ordering and deliveryof replacement parts can be shortened), which also enhances convenience.

In the system, the authenticator copies the information to theelectronic key (122), when performing the authentication check. Thisarrangement ensures that the information can be reliably read from thekey 122 if the lawnmower memory 126 b should fail. This eliminates theinconvenience of not being able to determine the failure cause becauseinformation cannot be read due to the breakdown.

In the system, the authenticator (126) copies the information to theelectronic key when the electronic key (122) is authenticated to be anauthorized key (S604, S610, S616), whereas the authenticator does notcopy the information to the electronic key when the electronic key (122)is not authenticated to be an authorized key (S604, S620). Thisarrangement ensures that the operating history and other information arereliably copied to the authorized key 122 and that copying ofinformation to an electronic key other than the authorized key (anunauthorized key) is prevented.

The system further includes: an informer (126 d, S608, S614) thatinforms the failure of the equipment to the operator when theinformation on the failure of the equipment (50) is copied to theelectronic key (122). With this, it becomes possible to let the operatorP recognize that a failure has occurred in the equipment 50.

The system further includes: an analyzer (132) that is providedseparately from the equipment (50) and reads the information copied inthe electronic key (122) to analyze. With this, the service techniciancan easily read the information through the analyzer 132 at a placeapart from the equipment 50.

In the system 26 a, the equipment comprises a lawnmower (50). With this,the operating history and failure information of the lawnmower 50 can beeasily and reliably read from the key 122, thus offering improvedconvenience while also making it possible to prevent theft of thelawnmower 50.

The remaining configuration is the same as that in the first embodiment.

Although the first embodiment is explained taking a moving object, i.e.,the small electric vehicle 10 as an example of the equipment having thesystem 26, it can be other kinds of equipment including moving objectssuch as four-wheeled vehicles, two-wheeled vehicles, etc., and machinessuch as lawnmowers, cultivators, generators, snow removal machines andmaterials handling machines.

Although the vehicle 10 is exemplified as the equipment and it isconfigured to supply the motor 22 (which is a power source of the wheels12), authentication ECU 34, etc., with operating power from the battery24, in the case where the equipment is a machine (e.g., a lawnmower or acultivator) having the engine as a power source, a magneto coil, recoilstarter and the like can be provided instead of the battery to supplypower from the magneto coil to the authentication ECU 34 and othercomponents (i.e., it can be battery-less).

Although the second embodiment is explained taking a machine, i.e., thelawnmower 50 as an example of the equipment having the system 26 a, itcan be other kinds of equipment including machines such as cultivators,generators, snow removal machines and materials handling machines, andmoving objects such as four-wheeled vehicles, two-wheeled vehicles andsmall electric vehicles.

The second embodiment is aimed to have an antitheft system which, basedon the configuration of the first embodiment, enables to copy theinformation on the operating history and on failure of the equipment.For that reason, although only single number of the lawnmower isdisclosed in the second embodiment, two or more lawnmower can be used inthe second embodiment.

Although the lawnmower 50 is configured to supply the authentication ECU126, etc., with operating power not from a battery but from the magnetocoil 106 (to have a battery-less configuration), it is alternativelypossible to replace the magneto coil 106 with a battery and supply theauthentication ECU 126, etc., with power from the battery.

Although the key 122 is constituted as an IC card, it is possibleinstead, for example, to incorporate a function similar to that of thekey 122 in a mobile phone so that the mobile phone can send informationdirectly to the terminal device 134 at the repair shop by electronicmail or the like via the Internet 142. This configuration enhancesconvenience by enabling quick transmission of lawnmower 50 operatinghistory, etc., to the terminal device 134.

Although the piston displacement of the engine 58 was specified, thespecified value is non-limiting example.

In the first and second embodiments, although the key 30, 122 and thereader/writer 34 c, 126 c of the authentication ECU 34, 126 (and thereader/writer 46, 136) are configured to exchange data usingshort-distance RFID wireless communication, it is alternatively possibleto exchange data via another type of wireless communication means orwired communication means.

Japanese Patent Application Nos. 2008-180557 and 2008-180558, both filedon Jul. 10, 2008, are incorporated herein in its entirety.

While the invention has thus been shown and described with reference tospecific embodiments, it should be noted that the invention is in no waylimited to the details of the described arrangements; changes andmodifications may be made without departing from the scope of theappended claims.

1. A system for preventing an equipment from theft, comprising: anelectronic key that is adapted to be carried by an operator of theequipment and stores authenticating data for identifying the operatorwho carries the electronic key; an authenticator that is installed atthe equipment and performs authentication check as to whether theelectronic key is an authorized key using stored key-checking data, whenthe authenticating data is outputted from the electronic key; and anelectronic key copier that is provided separately from the equipment andcopies the electronic key.
 2. The system according to claim 1, whereinthe electronic key comprises at least one of a first electronic key anda second electronic key copied from the first electronic key by theelectronic key copier, and the electronic key copier inhibits additionalcopying of the second electronic key.
 3. The system according to claim1, wherein the equipment comprises a moving object or an operatingmachine, and the electronic key stores authenticating data in a samenumber as that of the equipment.
 4. The system according to claim 1,further including: a memory that is installed at the equipment andstores information on at least one of operating history and failure ofthe equipment; and the authenticator copies the information to theelectronic key, when performing the authentication check.
 5. The systemaccording to claim 4, wherein the authenticator copies the informationto the electronic key when the electronic key is authenticated to be anauthorized key, whereas the authenticator does not copy the informationto the electronic key when the electronic key is not authenticated to bean authorized key.
 6. The system according to claim 4, furtherincluding: an informer that informs the failure of the equipment to theoperator when the information on the failure of the equipment is copiedto the electronic key.
 7. The system according to claim 4, furtherincluding: an analyzer that is provided separately from the equipmentand reads the information copied in the electronic key to analyze. 8.The system according to claim 1, wherein the electronic key copiercomprises a terminal device, and a reader/writer that is connected tothe terminal device and reads the authenticating data outputted from theelectronic key and writes the authenticating data to the electronic key.9. The system according to claim 1, wherein the equipment comprises anelectric vehicle.
 10. The system according to claim 1, wherein theequipment comprises a lawnmower.
 11. The system according to claim 1,wherein the electronic key comprises an IC card.